两级式中点可调三电平逆变器的研究
发布时间：2019-04-20 11:51
【摘要】：能源是人类生活的物质基础,传统的不可再生能源已经不能满足人类社会对能源的需求。新能源的开发和利用成为了解决能源问题的关键,在众多新能源中,太阳能以其清洁、可再生等优点受到世界各国的重视。逆变器是光伏发电系统中电能转换的关键,所以要尽可能的提高逆变器的效率。随着大功率设备的广泛应用,逆变器的控制精度、效率等需要进一步提高。由于两级式光伏逆变器具有可以扩宽直流输入侧电压范围,且控制方法简单、具有良好的系统稳定性和同步性等方面的优势,得到了广泛的应用。本文提出了一种新型两级式中点可调三电平逆变器,给出调制方法并进行仿真分析。文章首先介绍了逆变技术的研究背景和发展现状,着重分析了三种基本三电平逆变器的工作原理和优缺点,对一种NPC逆变器衍生的T型三电平逆变器进行分析,并将其应用在新的电路中。然后,针对普通两级式逆变器升压电路开关损耗大,没有合理的利用前级和后级之间的联系,仅使用后级调节中点电压平衡等问题,提出了一种新型两级式中点可调三电平逆变器,并详细分析了电路的拓扑结构和中点电压可调的工作原理。以二极管钳位式三电平逆变器为例,分析了载波层叠法、开关频率优化PWM法、消除特定谐波PWM法及空间矢量PWM法等几种常用多电平PWM调制方法的工作原理和适用范围,采用1/4三次谐波注入和对称平顶波PWM法作为后级的调制方法,分析和比较了两种方法下逆变器输出电压的谐波畸变率。在MATLAB中SIMULINK环境下建立了电路系统的仿真模型,仿真结果证明了新型电路的可行性和先进性。在理论和仿真的基础上,以型号为STM32F103VBT6的ARM芯片作为核心处理器设计了新型的两级式中点可调的三电平逆变器的硬件电路,并对硬件系统进行了详细的介绍。最后,对全文所做的工作进行了总结和展望。
[Abstract]:Energy is the material basis of human life, traditional non-renewable energy can not meet the needs of human society for energy. The development and utilization of new energy has become the key to solve the energy problem. Among the many new energy sources solar energy has been paid attention to by many countries for its advantages such as clean renewable and so on. Inverter is the key to power conversion in photovoltaic power generation system, so the efficiency of inverter should be improved as much as possible. With the wide application of high power equipment, the control accuracy and efficiency of inverter need to be further improved. Because the two-stage photovoltaic inverter can widen the DC input voltage range, and the control method is simple, it has the advantages of good system stability and synchronization, so it has been widely used. In this paper, a new type of two-stage mid-point adjustable three-level inverter is presented, and the modulation method is given and the simulation analysis is carried out. Firstly, this paper introduces the research background and development status of three basic three-level inverters, analyzes the working principles, advantages and disadvantages of three basic three-level inverters, and analyzes a T-type three-level inverter derived from NPC inverter. And it is applied to the new circuit. Then, aiming at the large switching loss of the common two-stage inverter boost circuit, there is no reasonable use of the relationship between the front stage and the back stage, and only the latter stage is used to adjust the midpoint voltage balance, and so on. A novel two-stage mid-point adjustable three-level inverter is proposed. The topology of the circuit and the working principle of the adjustable midpoint voltage are analyzed in detail. Taking diode-clamped three-level inverter as an example, the working principle and application range of several common multilevel PWM modulation methods, such as carrier stacking method, switching frequency optimization PWM method, elimination of specific harmonic PWM method and space vector PWM method, are analyzed. The harmonic distortion rate of the output voltage of the inverter is analyzed and compared by using 1 ~ 4 third harmonic injection method and symmetric flat top wave PWM method as the back stage modulation methods. The simulation model of the circuit system is established in the environment of SIMULINK in MATLAB. The simulation results show that the new circuit is feasible and advanced. On the basis of theory and simulation, the hardware circuit of a new two-stage three-level inverter with adjustable mid-point is designed by using ARM chip of model STM32F103VBT6 as the core processor, and the hardware system is introduced in detail. Finally, the work done in this paper is summarized and prospected.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM464
[Abstract]:Energy is the material basis of human life, traditional non-renewable energy can not meet the needs of human society for energy. The development and utilization of new energy has become the key to solve the energy problem. Among the many new energy sources solar energy has been paid attention to by many countries for its advantages such as clean renewable and so on. Inverter is the key to power conversion in photovoltaic power generation system, so the efficiency of inverter should be improved as much as possible. With the wide application of high power equipment, the control accuracy and efficiency of inverter need to be further improved. Because the two-stage photovoltaic inverter can widen the DC input voltage range, and the control method is simple, it has the advantages of good system stability and synchronization, so it has been widely used. In this paper, a new type of two-stage mid-point adjustable three-level inverter is presented, and the modulation method is given and the simulation analysis is carried out. Firstly, this paper introduces the research background and development status of three basic three-level inverters, analyzes the working principles, advantages and disadvantages of three basic three-level inverters, and analyzes a T-type three-level inverter derived from NPC inverter. And it is applied to the new circuit. Then, aiming at the large switching loss of the common two-stage inverter boost circuit, there is no reasonable use of the relationship between the front stage and the back stage, and only the latter stage is used to adjust the midpoint voltage balance, and so on. A novel two-stage mid-point adjustable three-level inverter is proposed. The topology of the circuit and the working principle of the adjustable midpoint voltage are analyzed in detail. Taking diode-clamped three-level inverter as an example, the working principle and application range of several common multilevel PWM modulation methods, such as carrier stacking method, switching frequency optimization PWM method, elimination of specific harmonic PWM method and space vector PWM method, are analyzed. The harmonic distortion rate of the output voltage of the inverter is analyzed and compared by using 1 ~ 4 third harmonic injection method and symmetric flat top wave PWM method as the back stage modulation methods. The simulation model of the circuit system is established in the environment of SIMULINK in MATLAB. The simulation results show that the new circuit is feasible and advanced. On the basis of theory and simulation, the hardware circuit of a new two-stage three-level inverter with adjustable mid-point is designed by using ARM chip of model STM32F103VBT6 as the core processor, and the hardware system is introduced in detail. Finally, the work done in this paper is summarized and prospected.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：TM464
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